Battery cover plate and battery

Abstract

The utility model provides a battery cover plate and battery wherein the battery cover plate comprises: a cover plate main body, the cover plate main body comprises a first plate body and a second plate body, an installation space is formed between the first plate body and the second plate body, the first plate body is welded to the second plate body; and the first plate body and the second plate body are matched to fix the periphery of the pole in the mounting space. According to the battery cover plate disclosed by the utility model, the first plate body is welded on the second plate body to form the cover plate main body, and the mounting space is formed between the first plate body and the second plate body to fix the periphery of the pole, so that compared with hot-pressing bonding, the stability and the reliability of connection of the battery cover plate can be obviously enhanced, and the service life of a battery is obviously prolonged; besides, the battery cover plate does not need to be additionally provided with a riveting structure, so that the overall thickness of the battery cover plate is obviously reduced, the light and thin design of the micro battery is facilitated, and the battery capacity can be increased under the same volume.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery cover and a battery. Background Technology

[0002] With the trend towards miniaturization and high performance in portable electronic devices, micro batteries, as core power supply components, face higher demands on size, performance, and stability. Currently, the terminals and cover plates of micro batteries are typically joined using thermoforming or riveting techniques. However, thermoforming is susceptible to electrolyte interference, leading to decreased connection reliability and consequently affecting battery sealing and lifespan. While riveting improves connection reliability, it increases the thickness of the battery cover plate, hindering thinner and lighter designs and reducing battery capacity. Utility Model Content

[0003] This utility model provides a new technical solution for battery cover plates, which can at least solve the problems of poor connection reliability or excessive thickness of existing battery cover plates.

[0004] This utility model also provides a new technical solution for batteries.

[0005] According to a first aspect of the present invention, a battery cover is provided, comprising: a first plate and a second plate, wherein the first plate is welded to one side of the second plate in the thickness direction, and an installation space is formed between the first plate and the second plate; and a terminal post, wherein the first plate and the second plate cooperate to fix the outer periphery of the terminal post within the installation space.

[0006] Optionally, an insulating sealing layer is provided between the pole and the inner wall of the installation space, and the welding positions of the first plate and the second plate are spaced apart from the insulating sealing layer.

[0007] Optionally, the first plate has a first groove on the side near the second plate, and the inner wall of the first groove and the second plate define the installation space; and / or, the second plate has a second groove on the side near the first plate, and the inner wall of the second groove and the first plate define the installation space.

[0008] Optionally, the first plate and the second plate are configured as stamped parts of a top hat structure, with the top of the first plate defining the first groove, the top of the second plate defining the second groove, and the brim of the first plate and the brim of the second plate being welded together.

[0009] Optionally, the first plate is used to fit against the end face of the battery housing to define the position of the battery cover in the axial direction of the battery housing; the outer peripheral surface of the second plate is used to fit against the inner wall surface of the battery housing to define the position of the battery cover in the radial direction of the battery housing.

[0010] Optionally, the first plate has a first through hole, the second plate has a second through hole, and the pole includes a body and a connecting part surrounding the body; wherein the position of the body corresponds to the position of the first through hole and the second through hole, the outer periphery of the connecting part is fixed in the installation space, the connecting part has a pressure relief groove, the pressure relief groove is offset from the position of the first plate and the second plate, and the pole can burst and release pressure along the pressure relief groove.

[0011] Optionally, the insulating sealing layer extends into the first through hole and the second through hole.

[0012] Optionally, the side of the pole opposite to the first through hole and the inner wall surface of the second through hole define a receiving space to receive at least a portion of the tab.

[0013] Optionally, the thickness of the connecting portion is less than the thickness of the body portion, and the side of the connecting portion away from the first through hole is flush with the body portion.

[0014] According to a second aspect of the present invention, a battery is provided, comprising the battery cover as described in any of the preceding claims.

[0015] According to the present invention, the battery cover plate forms the main body of the cover plate by welding the first plate to the second plate, and forming an installation space between the first plate and the second plate to fix the outer periphery of the terminal post. Compared with hot pressing bonding, this invention can significantly enhance the stability and reliability of the battery cover plate connection, thereby significantly extending the battery's service life. In addition, the battery cover plate of the present invention does not require additional riveting structures, which significantly reduces the overall thickness of the battery cover plate, which is beneficial to the lightweight design of micro batteries and can increase the battery capacity within the same volume.

[0016] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0018] Figure 1 This is a schematic diagram of the structure of a battery cover according to an embodiment of the present invention;

[0019] Figure 2 This is an exploded view of the structure of a battery cover plate according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of a battery cover according to another embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of a battery according to an embodiment of the present invention.

[0022] Figure Labels

[0023] 100. Battery cover;

[0024] 10. Cover plate body; 11. First plate; 11a. First through hole; 12. Second plate; 12a. Second through hole; 12b. Second groove;

[0025] 20. Pole post; 21. Body part; 22. Connecting part; 22a. Pressure relief groove;

[0026] 30. Insulating and sealing layer;

[0027] 200. Battery casing. Detailed Implementation

[0028] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0029] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0030] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0031] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0033] The battery cover 100 according to an embodiment of the present utility model will now be described in detail with reference to the accompanying drawings.

[0034] like Figures 1 to 3 As shown, the battery cover 100 according to an embodiment of the present invention includes a first plate 11, a second plate 12, and a terminal post 20.

[0035] Specifically, the first plate 11 is welded to one side of the second plate 12 in the thickness direction, and an installation space is formed between the first plate 11 and the second plate 12; the first plate 11 and the second plate 12 cooperate to fix the outer periphery of the pole post 20 in the installation space.

[0036] In other words, such as Figures 1 to 3 As shown, the battery cover 100 according to an embodiment of the present invention is mainly used in micro batteries. The battery cover 100 mainly includes a cover body 10 and an electrode post 20. The cover body 10 is composed of a first plate 11 and a second plate 12 stacked together, both of which can be made of steel sheets. The electrode post 20 can be an aluminum electrode post. An installation space for fixing the electrode post 20 is defined between the first plate 11 and the second plate 12.

[0037] When preparing the battery cover plate 100, the first plate 11, the terminal post 20, and the second plate 12 are placed in sequence to ensure that the terminal post 20 is located in the installation space between the first plate 11 and the second plate 12. Then, the first plate 11 and the second plate 12 are fixedly connected by welding (e.g., laser welding) so that the first plate 11 and the second plate 12 cooperate to clamp the outer periphery of the terminal post 20, thereby achieving a reliable connection between the terminal post 20 and the cover plate body 10.

[0038] Therefore, according to the battery cover 100 provided in this embodiment, by welding the first plate 11 to the second plate 12 to form the cover body 10, and forming an installation space between the first plate 11 and the second plate 12 to fix the outer periphery of the terminal post 20, the stability and reliability of the connection of the battery cover 100 can be significantly enhanced. Compared with hot pressing bonding, the service life of the battery is significantly extended. In addition, the battery cover 100 of this utility model does not require additional riveting structure, which significantly reduces the overall thickness of the battery cover 100, which is conducive to the lightweight design of micro batteries, and can increase the battery capacity in the same volume.

[0039] In some specific embodiments of this utility model, an insulating sealing layer 30 is provided between the pole post 20 and the inner wall of the installation space, and the welding positions of the first plate 11 and the second plate 12 are spaced apart from the insulating sealing layer 30.

[0040] like Figure 1 and Figure 3As shown, the pole post 20 is insulated from the cover plate body 10. Specifically, an insulating sealing layer 30 is provided between the pole post 20 and the inner wall of the installation space. The insulating sealing layer 30 can be a silicone layer coated on the outside of the pole post 20. The insulating sealing layer 30 abuts against the first plate 11 and the second plate 12 respectively, thereby achieving insulation and sealing between the pole post 20 and the cover plate body 10.

[0041] In this embodiment, the welding positions of the first plate 11 and the second plate 12 are spaced apart from the insulating sealing layer 30 in the radial direction of the pole post 20. This can effectively avoid damage to the insulating sealing layer 30 when the first plate 11 and the second plate 12 are welded, thereby ensuring the sealing and insulation performance of the battery cover 100 and extending the battery's service life.

[0042] According to one embodiment of the present invention, a first groove is provided on the side of the first plate 11 near the second plate 12, and the inner wall surface of the first groove and the second plate 12 define an installation space; and / or, a second groove 12b is provided on the side of the second plate 12 near the first plate 11, and the inner wall surface of the second groove 12b and the first plate 11 define an installation space.

[0043] In other words, such as Figure 1 and Figure 3 As shown, the formation of installation space includes the following situations:

[0044] Case 1: The first plate 11 is provided with a first groove on the side (i.e., the lower side) near the second plate 12, and the inner wall of the first groove and the upper surface of the second plate 12 define the installation space.

[0045] Case 2: The second plate 12 is provided with a second groove 12b on the side (i.e., the upper side) close to the first plate 11, and the inner wall of the second groove 12b and the lower surface of the first plate 11 define the installation space.

[0046] Case 3: The lower side of the first plate 11 is provided with a first groove, and the upper side of the second plate 12 is provided with a second groove 12b. The inner wall of the first groove and the inner wall of the second groove 12b define the installation space.

[0047] In this embodiment, the first groove can define the relative position of the pole post 20 and the first plate 11, and the second groove 12b can define the relative position of the pole post 20 and the second plate 12, thereby making the assembly operation in the production process more convenient and effectively improving production efficiency.

[0048] In some specific embodiments of this utility model, the first plate 11 and the second plate 12 are configured as stamped parts of a top hat structure. The top of the first plate 11 defines a first groove, and the top of the second plate 12 defines a second groove 12b. The brim of the first plate 11 and the brim of the second plate 12 are welded together.

[0049] Specifically, such as Figure 1 and Figure 3 As shown, the first plate 11 and the second plate 12 have roughly the same structure, adopting a top hat structure design. During manufacturing, they can be processed into stamped parts using a stamping process. A first groove is defined on the inner side (i.e., the lower side) of the top of the first plate 11, and a second groove 12b is defined on the inner side of the top of the second plate 12. The tops of the first plate 11 and the second plate 12 are positioned opposite each other, defining an installation space. The brims of the first plate 11 and the second plate 12 are welded together to achieve a connection and fixation between the first plate 11 and the second plate 12.

[0050] In this embodiment, both the first plate 11 and the second plate 12 are stamped parts with a top hat structure, which are simple in structure and easy to produce and assemble.

[0051] According to one embodiment of the present invention, the welding position of the first plate 11 and the second plate 12 is located at the middle part of the outer edge and the inner edge of the brim of the first plate 11, or at the middle part of the outer edge and the inner edge of the brim of the second plate 12. This can effectively prevent the temperature of the first plate 11 and the second plate 12 during welding from damaging the insulating sealing layer 30 on the outside of the pole post 20.

[0052] In some optional embodiments of this utility model, the welding portion of the first plate 11 and the second plate 12 is formed as an annular structure extending circumferentially along the pole post 20; or, the welding portion of the first plate 11 and the second plate 12 includes multiple welding points, which are evenly distributed circumferentially along the pole post 20.

[0053] In some specific embodiments of this utility model, the first plate 11 is used to fit with the end face of the battery housing 200 to define the position of the battery cover 100 in the axial direction of the battery housing 200; the outer peripheral surface of the second plate 12 is used to fit with the inner wall surface of the battery housing 200 to define the position of the battery cover 100 in the radial direction of the battery housing 200.

[0054] In other words, such as Figure 4As shown, the first plate 11 serves as the outer component of the battery, and the second plate 12 serves as the inner component. The radial dimension of the first plate 11 is larger than the opening at one end of the battery housing 200, and the radial dimension of the second plate 12 is the same as the opening at one end of the battery housing 200. During battery assembly, the side of the first plate 11 closest to the second plate 12 (i.e., the lower side) contacts the upper surface of the battery housing 200, thereby defining the position of the battery cover 100 axially within the battery housing 200, preventing the battery cover 100 from falling into the battery housing 200. The second plate 12 is located inside the battery housing 200, and its outer peripheral surface contacts the inner wall surface of the battery housing 200, thereby defining the position of the battery cover 100 radially within the battery, ensuring the concentricity of the battery cover 100 and the battery housing 200, thus ensuring battery quality and facilitating production assembly.

[0055] According to one embodiment of the present invention, the first plate 11 is provided with a first through hole 11a, the second plate 12 is provided with a second through hole 12a, and the pole post 20 includes a body part 21 and a connecting part 22 surrounding the body part 21; wherein, the position of the body part 21 corresponds to the position of the first through hole 11a and the second through hole 12a, the outer periphery of the connecting part 22 is fixed in the installation space, the connecting part 22 is provided with a pressure relief groove 22a, the pressure relief groove 22a is offset from the position of the first plate 11 and the second plate 12, and the pole post 20 can burst and release pressure along the pressure relief groove 22a.

[0056] Specifically, such as Figure 1 and Figure 3 As shown, the first plate 11 has a first through hole 11a extending through its thickness at the center of its cap, and the second plate 12 has a second through hole 12a extending through its thickness at the center of its cap. The pole post 20 is a one-piece metal part, mainly composed of a body part 21 and a connecting part 22 surrounding the outer periphery of the body part 21. The body part 21 is coaxially arranged with the first through hole 11a and the second through hole 12a. A part of the connecting part 22 corresponds to the position of the first through hole 11a and the second through hole 12a, and the other part of the connecting part 22 is located in the mounting space between the first plate 11 and the second plate 12.

[0057] like Figure 3 As shown, the connecting portion 22 has a first side and a second side disposed opposite to each other in its thickness direction. The first side and / or the second side of the connecting portion 22 are provided with a pressure relief groove 22a. The pressure relief groove 22a can be a stamped groove or a groove, and its depth can be determined according to actual needs. The position of the pressure relief groove 22a corresponds to the position of the first through hole 11a and the second through hole 12a, thereby making the position of the pressure relief groove 22a offset from that of the cover plate body 10.

[0058] In this embodiment, by providing a pressure relief groove 22a, the terminal post 20 can be used as an explosion-proof valve. When the internal pressure of the battery is too high, the terminal post 20 can burst and release pressure along the location of the pressure relief groove 22a, thus eliminating the need for an additional explosion-proof structure and making the battery more compact and lightweight.

[0059] In some specific embodiments of this utility model, the insulating sealing layer 30 extends into the first through hole 11a and the second through hole 12a.

[0060] In other words, such as Figure 1 and Figure 3 As shown, the insulating sealing layer 30 located on the side of the connecting portion 22 near the first plate 11 extends into the first through hole 11a, and the insulating sealing layer 30 located on the side of the connecting portion 22 near the second plate 12 extends into the second through hole 12a. This can increase the creepage distance between the terminal post 20 and the cover plate body 10, effectively prevent electric arcing between the terminal post 20 and the cover plate body 10, and improve the safety of the battery.

[0061] According to one embodiment of the present invention, the side of the pole post 20 opposite to the first through hole 11a and the inner wall surface of the second through hole 12a define a receiving space to receive at least a portion of the pole tab.

[0062] In this embodiment, the accommodating space can accommodate a portion of the tab, thereby reducing the overall thickness and volume of the battery, which is beneficial for the lightweight design of micro batteries and can increase battery capacity within the same volume.

[0063] In some specific embodiments of this utility model, the thickness of the connecting part 22 is less than the thickness of the body part 21, and the side of the connecting part 22 away from the first through hole 11a is flush with the body part 21.

[0064] like Figure 1 and Figure 3 As shown, the electrode post 20 has a stepped boss structure. Specifically, the electrode post 20 includes a body part 21 and a connecting part 22 located on the outer periphery of the body part 21. The thickness of the connecting part 22 is less than the thickness of the body part 21, and the lower side of the connecting part 22 is flush with the lower side of the body part 21. This prevents the body part 21 from extending into the second through hole 12a, thereby providing sufficient space for the electrode tab and further reducing the overall thickness and volume of the battery. It also allows the body part 21 to extend into the first through hole 11a for electrical connection with the external structure.

[0065] According to one embodiment of the present invention, the main body 21 is flush with the side of the first plate 11 away from the second plate 12, or the main body 21 protrudes from the first plate 11.

[0066] like Figure 4As shown, an embodiment of the present invention also provides a battery, including the battery cover 100 described in any of the above embodiments. Since the battery cover 100 according to the embodiments of the present invention has the above-described effects, the battery according to the embodiments of the present invention also has corresponding technical effects, which will not be repeated in this embodiment.

[0067] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0068] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A battery cover, characterized in that, include: A first plate (11) and a second plate (12), wherein the first plate (11) is welded to one side of the second plate (12) in the thickness direction, and an installation space is formed between the first plate (11) and the second plate (12); The pole post (20) is fixed in the installation space by the cooperation of the first plate (11) and the second plate (12).

2. The battery cover according to claim 1, characterized in that, An insulating sealing layer (30) is provided between the pole post (20) and the inner wall of the installation space, and the welding positions of the first plate (11) and the second plate (12) are spaced apart from the insulating sealing layer (30).

3. The battery cover according to claim 1, characterized in that, The first plate (11) has a first groove on the side near the second plate (12), and the inner wall of the first groove and the second plate (12) define the mounting space; and / or, The second plate (12) has a second groove (12b) on the side near the first plate (11), and the inner wall of the second groove (12b) and the first plate (11) define the installation space.

4. The battery cover according to claim 3, characterized in that, The first plate (11) and the second plate (12) are configured as stamped parts of a top hat structure. The top of the first plate (11) defines the first groove, and the top of the second plate (12) defines the second groove (12b). The brim of the first plate (11) and the brim of the second plate (12) are welded together.

5. The battery cover according to claim 1, characterized in that, The first plate (11) is used to fit against the end face of the battery housing (200) to define the position of the battery cover (100) in the axial direction of the battery housing (200); The outer peripheral surface of the second plate (12) is used to fit against the inner wall surface of the battery housing (200) to define the position of the battery cover (100) in the radial direction of the battery housing (200).

6. The battery cover according to claim 2, characterized in that, The first plate (11) is provided with a first through hole (11a), the second plate (12) is provided with a second through hole (12a), and the pole post (20) includes a body part (21) and a connecting part (22) surrounding the body part (21); The position of the main body (21) corresponds to the position of the first through hole (11a) and the second through hole (12a). The outer periphery of the connecting part (22) is fixed in the installation space. The connecting part (22) is provided with a pressure relief groove (22a). The pressure relief groove (22a) is offset from the position of the first plate (11) and the second plate (12). The pole post (20) can burst and release pressure along the pressure relief groove (22a).

7. The battery cover according to claim 6, characterized in that, The insulating sealing layer (30) extends into the first through hole (11a) and the second through hole (12a).

8. The battery cover according to claim 6, characterized in that, The pole post (20) on the side opposite to the first through hole (11a) and the inner wall surface of the second through hole (12a) define a receiving space to receive at least a portion of the pole tab.

9. The battery cover according to claim 6, characterized in that, The thickness of the connecting portion (22) is less than the thickness of the body portion (21), and the side of the connecting portion (22) away from the first through hole (11a) is flush with the body portion (21).

10. A battery, characterized in that, The battery cover includes any one of claims 1 to 9.

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